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Optimization of Equipment Maintenance Criterion Involving Minimum Average Cost and Remaining Lifetime Based on Indirect Monitoring

Author: ZhangLiYuan
Tutor: ChenYouLing
School: Chongqing University
Course: Industrial Engineering
Keywords: State of repair Indirect condition monitoring Minimum average repair costs The residual life of equipment Decision criteria
CLC: TH165.3
Type: Master's thesis
Year: 2011
Downloads: 34
Quote: 0
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Abstract


Modern manufacturing equipment is the core of the enterprise, in order to ensure that production can be carried out smoothly, and enterprises to use more state maintenance (Condition Based Maintenance) to carry out maintenance on the equipment. State maintenance at different time points collect diagnostic equipment aging, and ultimately advance replacement of wearing parts of a preventive maintenance tracking and associated index value through operational status of equipment. Many scholars in the past, the domestic and foreign literature, the optimum maintenance strategy for the direct monitoring state paper aimed at the deterioration of the state under the monitoring of the indirect state and can not be directly diagnostic equipment to develop the optimal cost preventive maintenance strategy. Among them, the failure rate of the device using Weibull proportional hazard models to represent; state probability using Bayesian formula to calculate; partially observable Markov decision processes and dynamic programming method combined standard setting process of decision-making. This paper introduces the concept of the decision criteria sake of discussion. In fact, the decision criteria of equipment preventive maintenance depends on the device has been used to age, equipment deterioration state probability distribution and equipment replacement minimum average maintenance costs. This article assumes that the deterioration of the equipment state Markov chain random probability relations established between the index value and the aging state, and the use of Bayesian rules and hidden Markov model. Decision criteria for determining minimum average maintenance costs of this article introduces a recursive calculation method, and by example to verify the reasonableness of the iterative method, and compared the long-term average cost of the equipment under the monitoring of the direct and indirect state Chapter finally parameters change characteristics of the devices under different conditions of the long-term average maintenance costs. Chapter IV of this article also gives the device reliability function in the aging state of the device can not be directly measured by condition monitoring some useful information on the case can be obtained under the less in view of the the traditional maintenance decision-making model to consider the issue of availability of equipment, modeling approach and its residual life. Finally, through specific cases develop optimal maintenance strategy the indirect condition monitoring based on the method of combining minimum maintenance costs and residual life implementation steps, use of minimum maintenance cost and the residual life of the combination method to develop the device status maintenance decision criteria can not only save maintenance costs can also be effective in preventing sudden shutdown of equipment.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Flexible manufacturing systems and flexible manufacturing cell > Fault diagnosis and maintenance
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